Surviving and finding a safe place to lay her eggs is difficult for Hypsilophodon with dinosaurs like Tyrannosaurus Rex around. When she falls into a mysterious pool and finds herself on a modern farm there are still problems. Finally she finds a safe place to hatch her babies, but how can she keep thirteen baby dinosaurs safe and secret? When the farmer catches one - Hector - and plans to take him to the vet, it's up to Hypsilophodon and her fiesty daughter, Henrietta, to get him back. After adaring rescue, Hypsilophodon takes all her youngsters back through the mysterious pool to her own world.